Reliability, what owners report, and what it costs to keep.
AVOIR's read: the numbers are mixed and the complaint record is worth reading before you commit.
Owners have filed 166 complaints with NHTSA about the 1999 Mercury Mountaineer, and it carries 9 recalls. These are owner allegations rather than confirmed defects, but the pattern of what people complain about is the most useful signal a used buyer has.
| Area | Complaints | Share |
|---|---|---|
| Tires | 51 | 31% |
| Visibility | 20 | 12% |
| Air bags | 13 | 8% |
| Vehicle speed control | 10 | 6% |
| Engine and engine cooling | 8 | 5% |
| Electrical system | 7 | 4% |
| Power train | 6 | 4% |
| Service brakes | 6 | 4% |
| Structure | 5 | 3% |
| Suspension | 4 | 2% |
Verbatim from NHTSA complaint records, trimmed for length.
CURSE CONTROL OCCASIONALLY MAKES ENGINE ACCELERATE WHILE AND AFTER BRAKE APPLIED WHILE MOVING UNDER 5 MPH AND EVEN WHILE STOPPED WITH BRAKE STILL APPLIED. MORE THAN ONCE A PEDESTRIAN WAS AT RISK IN A CROSSWALK WHILE VE
NHTSA complaint: Vehicle speed control
EXPLODING AIRBAGS FILLED VEHICLE WITH SMOKE AND ASH. I RECEIVED MINOR BURNS AND ABRASIONS ON ARMS AND FACE, DAUGHTER RIDING IN BACK SEAT RECEIVED BLACK EYE FORM FLYING OBJECT AND REQUIRED SCAN OF HEAD TO RULE OUT HEAD I
NHTSA complaint: Air bags
TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER EQUIPPED WITH COOPER DISCOVERER H/T TIRES, SIZE: P265/75R15. WHILE DRIVING APPROXIMATELY 70 MPH, A LOUD BANGING NOISE CAME FROM THE REAR OF THE VEHICLE. AFTER STOPPING TO I
NHTSA complaint: Tires
TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER. THE CONTACT STATED THAT WHILE DRIVING AT 30 MPH, THE CHECK ENGINE WARNING LIGHT ILLUMINATED. THE FAILURE OCCURRED ON MULTIPLE OCCASIONS. THE VEHICLE WAS TAKEN TO AN INDEPE
NHTSA complaint: Power train
CHECK ENGINE LIGHT WAS ON. RAN DIAGNOSTICS TO DETERMINE THE FUEL TANK WAS NOT PULLING A VACUUM. DETERMINED THE FUEL FILLER NECK PIPE WAS CRACKED AT THE TOP OF THE LINE NEAR THE TANK CAP. WENT TO REPLACE THE FUEL FILLER N
NHTSA complaint: Fuel system
TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER. THE VEHICLE WAS EQUIPPED WITH GOODYEAR WRANGLER TIRES, LINE SIZE: P235/75/R15, DOT NUMBER: RTN-ST235-75-15105S. THE CONTACT STATED THAT WHILE DRIVING 70 MPH, THE FRONT PAS
NHTSA complaint: Tires
HAVE BEEN HAVING TROUBLE WITH DOOR LOCKS, DELAY SWITCH ON REARVIEW MIRROR, WINDOW LOCK AND WINDOW FUNCTIONS, ABS ON ALL THE TIME ,DOOR AJAR LIGHT ON ALL THE TIME. NONFUNCTIONING DOME LIGHT SWITCHES AND INTERMITTENT CHECK
NHTSA complaint: Electrical system
TL* THE CONTACT OWNS A 1999 MERCURY MOUNTAINEER. THE CONTACT STATED THAT THE VEHICLE WAS PARKED AND IDLE WHEN IT CAUGHT IN FIRE FROM THE ENGINE AREA AND SPREAD TO THE INSTRUMENT PANEL. THE INSTRUMENTAL PANEL AND THE ENGI
NHTSA complaint: Engine and engine cooling
NHTSA lists 9 recall campaigns for the 1999 Mercury Mountaineer. Recalls are free to have fixed at a franchised dealer regardless of who owns the car now, but only if they were never done, so check the VIN of the specific car rather than trusting the model.
CERTAIN AFTERMARKET FUEL FILTERS SOLD UNDER THE PUROLATOR BRAND NAME, P/N F65277, SHIPPED FROM JANUARY 16 THROUGH JUNE 2, 2006, FOR USE ON THE ABOVE LISTED PASSENGER VEHICLES. DUE TO INCORRECT DESIGN, THE QUICK CONNECTORS MAY NOT FULLY SEAT WITH THE TUBE INTERFACE, EVEN THOUGH THE PERSON MAKING THE
Risk: FAILURE OF THIS CONNECTION COULD LEAD TO FUEL SPILLAGE AND, IN THE PRESENCE OF AN IGNITION SOURCE, A FIRE COULD OCCUR.
Fix: UFI WILL NOTIFY OWNERS AND REPLACE THE FILTERS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 4, 2006. OWNERS MAY CONTACT UFI FILTERS USA AT 800-230-5876.
ON CERTAIN PICKUP TRUCKS, PASSENGER VEHICLES, SPORT UTILITY VEHICLES, AND MOTOR HOMES CHASSIS, THE SPEED CONTROL DEACTIVATION SWITCH MAY, UNDER CERTAIN CONDITIONS, LEAK INTERNALLY AND THEN OVERHEAT, SMOKE, OR BURN.
Risk: THIS COULD RESULT IN AN UNDERHOOD FIRE.
Fix: DEALERS WILL INSTALL A FUSED WIRING HARNESS. OWNERS OF THE PASSENGER CARS INCLUDED IN THIS CAMPAIGN WILL BE INSTRUCTED TO RETURN THEIR VEHICLES TO THEIR DEALERS TO HAVE THE SPEED CONTROL DEACTIVATION
VEHICLE DESCRIPTION: MULTI-PURPOSE VEHICLES EQUIPPED WITH 4.0L ENGINES AND ALL-TIME 4-WHEEL DRIVE (A4WD) POWERTRAINS. THE GENERIC ELECTRONIC MODULE (GEM) COULD EXPERIENCE A CONDITION REFERRED TO AS "LOCK-UP" IN WHICH THE GEM CONTROLLED ELECTRONIC FUNCTIONS (E.G., FRONT WINDSHIELD WIPERS, INTERIOR
Risk: AN INOPERATIVE WINDSHIELD WIPER SYSTEM COULD AFFECT DRIVER VISIBILITY, INCREASING THE RISK OF A CRASH.
Fix: DEALERS WILL INSTALL A RESISTOR IN THE GEM CIRCUIT.
TIRE DESCRIPTION: FIRESTONE WILDERNESS AT, SIZE P235/75R15, PRODUCED AT THE DECATUR, ILLINOIS TIRE PLANT AND ALL FIRESTONE RADIAL ATX AND RADIAL ATX II TIRES, SIZE P235/75R15. OPERATION OF THESE TIRES AT LOW INFLATION PRESSURES, HIGH SPEED, AND IN HOT WEATHER, CAN CONTRIBUTE TO SEPARATION OF THE T
Risk: IF THE TREAD SEPARATES FROM THE TIRE, THE DRIVER CAN LOSE CONTROL OF THE VEHICLE, POSSIBLY RESULTING IN A CRASH CAUSING INJURY OR DEATH.
Fix: THE REPLACEMENT/REIMBURSEMENT PROGRAM FOR THIS CAMPAIGN EXPIRED ON AUGUST 29, 2001. HOWEVER, CUSTOMERS SHOULD CONTACT FIRESTONE CUSTOMER SERVICE AT 1-800-465-1904 FOR POSSIBLE ASSISTANCE.
| Reliability raw | 76 | good |
|---|---|---|
| Longevity est. | 76 | good |
| Maintenance | 71 | good |
| Depreciation | 67 | good |
| Performance | 65 | good |
| Efficiency | 31 | below average |
Percentile ranks against other SUVs in the catalog.
What stands behind each score for this car:
Owners have filed 166 complaints with NHTSA for this model-year, and tires is the most reported area with 51 of them (31%). There are 9 recalls on record. Check any specific car against its VIN before buying.
AVOIR scores its reliability 76/100 (good) from NHTSA recall campaigns and complaint density. That figure is a raw complaint count, not yet adjusted for sales volume, so a high-volume model scores worse than it deserves.
AVOIR scores its longevity 76/100, but that figure is an estimate built from the powertrain and the brand's record, not a measurement. A 1999 car has no 200,000-mile population to observe yet, so treat it as a prior rather than evidence.
AVOIR's read: be careful, because the numbers are mixed and the complaint record is worth reading before you commit. Its overall ownership score is 68/100. Condition, mileage and service history still matter more than any score, so get a pre-purchase inspection on the specific car.
Sources: NHTSA recalls and complaints, EPA fuel economy, IIHS awards, and live market listings. A score describes a model-year, not the individual car in front of you. Get a pre-purchase inspection.